danny_galaga Posted December 20, 2020 Share Posted December 20, 2020 Anything smaller than 2 1/4" around? I don't care that much about a VSI but if there's something tiny I'll squeeze it in somewhere 😄  Even if someone knows of a construction article for a digital one I'd have a look. Link to comment Share on other sites More sharing options...
Subsonic Posted December 20, 2020 Share Posted December 20, 2020 This experimental DIY EFIS has VSI Â https://experimentalavionics.com/efis-ver-2-0/ Â Â Link to comment Share on other sites More sharing options...
skippydiesel Posted December 21, 2020 Share Posted December 21, 2020 I dont work well in imperial so I assume you mean 57 mm diameter. Below is my panel. Two full size gauges and the rest small. I cant remember the dimensions off hand but if you are interested I will find out. 3 Link to comment Share on other sites More sharing options...
onetrack Posted December 21, 2020 Share Posted December 21, 2020 (edited) Subsonic - The unit you linked to has no dimensions listed - but checking the details on the Display Unit shows it is "4 inches". I'm presuming that is the width, it appears the height is not listed. Â Danny -Â Have you considered a Radiant unit? They fit in a standard 2-1/4" instrument hole (57mm). Is there some highly important reason you need the unit smaller than 2-1/4"? Â https://radiantinstruments.com/search.php?Search=&search_query=vsi Edited December 21, 2020 by onetrack Link to comment Share on other sites More sharing options...
danny_galaga Posted December 21, 2020 Author Share Posted December 21, 2020 (edited) 31 minutes ago, onetrack said: Subsonic - The unit you linked to has no dimensions listed - but checking the details on the Display Unit shows it is "4 inches". I'm presuming that is the width, it appears the height is not listed.  Danny - Have you considered a Radiant unit? They fit in a standard 2-1/4" instrument hole (57mm). Is there some highly important reason you need the unit smaller than 2-1/4"?  https://radiantinstruments.com/search.php?Search=&search_query=vsi [quote] I don't care that much about a VSI but if there's something tiny I'll squeeze it in somewhere 😄 [/quote]  Yes radiant caught my eye early in the build but in the end it meant too many digital inputs. And they seem to have gone to ground after the tragic factory fire. So I have a mix of mechanical and digital inputs instruments. Going to check out subsonics link. Might be the go Edited December 21, 2020 by danny_galaga Link to comment Share on other sites More sharing options...
danny_galaga Posted December 21, 2020 Author Share Posted December 21, 2020 Some more diy food for thought  https://www.google.com/amp/s/wildlab.org/index.php/2015/07/07/arduino-variometer/amp/  https://www.homebuiltairplanes.com/forums/threads/arduino-altimeter-airspeed-indicator.21605/    Link to comment Share on other sites More sharing options...
RFguy Posted December 21, 2020 Share Posted December 21, 2020 well, a freescale MPX temp comp pressure transducer maybe a MPX5050DP and a small micro arduino and LCD would do it. . what, about 1cm tall digits ???? put it in a matchbox.  but perhaps for suitable, how about convert one of your other 2 1/4 instruments to a multi instrument like an Uavionix AV30 ?   Link to comment Share on other sites More sharing options...
AlanB Posted December 21, 2020 Share Posted December 21, 2020 How tiny? http://www.paraoz.com.au/mini-vario.html 37mmx37mm. Has analogue and digital vsi display as well as altimeter. 1 2 Link to comment Share on other sites More sharing options...
danny_galaga Posted December 22, 2020 Author Share Posted December 22, 2020 (edited) 2 hours ago, AlanB said: How tiny? http://www.paraoz.com.au/mini-vario.html 37mmx37mm. Has analogue and digital vsi display as well as altimeter. Thankyou so much! That seems perfect! When I get home I'm going to see where it can go on the instrument panel else I just wear it instead of a watch 😎  And as a bonus it also does altitude so it can be a backup for my main instrument Edited December 22, 2020 by danny_galaga Link to comment Share on other sites More sharing options...
jackc Posted December 22, 2020 Share Posted December 22, 2020 On 21/12/2020 at 11:58 AM, skippydiesel said: I dont work well in imperial so I assume you mean 57 mm diameter. Below is my panel. Two full size gauges and the rest small. I cant remember the dimensions off hand but if you are interested I will find out. How do you find the Avmap Ultra? Â Much work to install? Link to comment Share on other sites More sharing options...
skippydiesel Posted December 22, 2020 Share Posted December 22, 2020 2 hours ago, jackc said: How do you find the Avmap Ultra?  Much work to install? I found it easy to install. A bit of a pain in the a-- to align the compass. AH a little slow to respond to changes in aircraft attitude. In the scheme of things, not to costly. Useful slip ball. Gives some interesting information but in general I can get the same information from a number of different "tools" I purchased it to give my panel a slightly up market look , nice to have an AH in the centre, which it does quite nicely. Not sure that I would recommend one as a serious aviation tool. 1 Link to comment Share on other sites More sharing options...
danny_galaga Posted December 22, 2020 Author Share Posted December 22, 2020 @skippydieselI guess your VSI is calibrated in meters per second and your ASI in kilometres per hour 😄  @RFguyI looked at that multi instrument you mentioned. I think that costs more than all my other instruments combined 😄 Link to comment Share on other sites More sharing options...
skippydiesel Posted December 22, 2020 Share Posted December 22, 2020 6 hours ago, danny_galaga said: @skippydieselI guess your VSI is calibrated in meters per second and your ASI in kilometres per hour 😄   Strange for sure - we, in Australian aviation, have this weirdly mixed metric/imperial measuring system - makes no sense at all and although we get used to it eventually, it makes for an unnecessary complication.   1 Link to comment Share on other sites More sharing options...
danny_galaga Posted December 23, 2020 Author Share Posted December 23, 2020 5 hours ago, skippydiesel said: Strange for sure - we, in Australian aviation, have this weirdly mixed metric/imperial measuring system - makes no sense at all and although we get used to it eventually, it makes for an unnecessary complication. Â Â Yeah just giving you a hard time. I'm quite the metric advocate myself. Just been so long since I even looked at my instrument panel (it's in a cupboard right now) that I couldn't think of how the sizes worked. For sure now I think of it the smaller ones are 57 and 53. They come from Spain Link to comment Share on other sites More sharing options...
danny_galaga Posted July 28, 2022 Author Share Posted July 28, 2022 Well my habit of dragging my feet seems to have paid off. This looks interesting, and it includes an artificial Horizon. I haven't found out what the exact dimensions are, but since I first posted, I've noticed another spot I could put this, I think. Price is good too. Good enough fort my ultralight 🙂   2 Link to comment Share on other sites More sharing options...
facthunter Posted July 28, 2022 Share Posted July 28, 2022 VSI with digital is not intuitive. Needles are more so. There are IVSI's which are more reactive. Baro instruments have hysteresis. (sticking Lag).. Nev 1 Link to comment Share on other sites More sharing options...
Yenn Posted July 28, 2022 Share Posted July 28, 2022 I read about this yesterday and it looks good. It was only a few mm in depth, 8mm from memory. Rather like the smallest Dynon on offer, but I think it was quooted as US$399, which looked like good value to me. Not as good as the Dynon, but much easier on the wallet. 1 Link to comment Share on other sites More sharing options...
lyle janke Posted July 28, 2022 Share Posted July 28, 2022 hi this is the latest offering from radiant instruments it might be what you are looking for https://www.radiantinstruments.com/product/flight-sensor-pack allways pricey as everything is built by hand but quality & great company to deal with Link to comment Share on other sites More sharing options...
Roscoe Posted July 28, 2022 Share Posted July 28, 2022 5 hours ago, lyle janke said: hi this is the latest offering from radiant instruments it might be what you are looking for https://www.radiantinstruments.com/product/flight-sensor-pack allways pricey as everything is built by hand but quality & great company to deal with I am currenly in Oshkosh and saw them demonstrating this item. I believe the $299 is USD!  Link to comment Share on other sites More sharing options...
onetrack Posted July 28, 2022 Share Posted July 28, 2022 (edited) US$299 is around AU$430. Most blokes wouldn't bat an eyelid at forking out that amount, to purchase a new kitchen aid, to keep the better half happy. You can't even buy a half-decent new mobile phone for that kind of money. Â Â Edited July 28, 2022 by onetrack 2 Link to comment Share on other sites More sharing options...
facthunter Posted July 29, 2022 Share Posted July 29, 2022 Why do you need a specific VSI.? The feet hand on the altimeter does the same job. You can't fly on anything better than an attitude for maintaining control the easiest way. Real or artificial. Nev 2 1 Link to comment Share on other sites More sharing options...
danny_galaga Posted July 29, 2022 Author Share Posted July 29, 2022 21 minutes ago, facthunter said: Why do you need a specific VSI.? The feet hand on the altimeter does the same job. You can't fly on anything better than an attitude for maintaining control the easiest way. Real or artificial. Nev I've designed my panel around that thought process. I think we may have discussed this before. I virtually never even look at an asi. But I figured I might need something temporary for flight testing. What are your thoughts? Link to comment Share on other sites More sharing options...
Blueadventures Posted July 29, 2022 Share Posted July 29, 2022 13 minutes ago, danny_galaga said: I've designed my panel around that thought process. I think we may have discussed this before. I virtually never even look at an asi. But I figured I might need something temporary for flight testing. What are your thoughts? Myself I regularly check the asi info and compare to GNs in flight and more so in turbulence. Before joining down wind and in the circuit I reference the asi. By this I mean I don't watch it and chase the numbers; but just a scan glance to see the numbers and adjust my target depending on the flying weight (eg solo or two up and amount of luggage and the strip condition sealed / grass or a rough unknown road or property).  I also ensure my asi is calibrated at annual inspection.  Cheers Link to comment Share on other sites More sharing options...
facthunter Posted July 29, 2022 Share Posted July 29, 2022 IF you don't change POWER and ATTITUDE the Airspeed will stay constant.  This is relied on when landing when you transfer your vision to outside the cockpit. Autopilots do have a function Vertical Speed setting which has a zero of straight and level. Both S & L and V/S are not "safe" modes as regards airspeed security. A power change will change things. These are the modes where power controls airspeed and the elevators don't.  Nev Link to comment Share on other sites More sharing options...
Bruce Tuncks Posted July 29, 2022 Share Posted July 29, 2022 I reckon the asi is real important. That and the Altimeter and the CHT's might be all you really need. BUT a mate with a Chipmunk gave me a flight one day.... NO CHT! I said that I flew on the CHT. He said that there never had been one on this plane in 60 years. Â 1 1 1 Link to comment Share on other sites More sharing options...
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